What Are the Warnings and Side Effects of Prednisone?

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Some of the side effects of the medication prednisone are nausea, vomiting, loss of appetite, sweating and trouble sleeping, according to WebMD. Patients taking prednisone are warned to limit alcohol intake during use and avoid use during pregnancy whenever possible.

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Rare side effects of prednisone that warrant immediate medical attention include muscle pain, cramps, irregular heartbeat, visual disturbance and mood changes, according to WebMD. Prednisone can mask signs of infection, increase the risk of infection or worsen current infections. People using this drug should practice good hygiene and avoid contact with those who have contagious infections. Use of this medication during pregnancy or breastfeeding should be restricted to only when it is absolutely necessary.